支持opencv 4.2以上的版本
1、conan 安装 （Python2可能会有问题）
pip3 install conan
2、添加文件库
conan remote add bincrafters https://api.bintray.com/conan/bincrafters/public-conan
conan remote add conan-community https://api.bintray.com/conan/conan-community/conan
conan remote add conan-center https://conan.bintray.com
3、conanfile.txt
[requires]
opencv/4.2.0【@conan/stable】
[generators]
cmake
4、查看conan支持哪个版本的opencv
conan search opencv --remote=bincrafters
conan search opencv --remote=conan-community
conan search opencv --remote=conan-center
5、如果支持则在build下执行以下命令，下载相关包同时生成 conanbuildinfo.cmake文件
conan install ..
6、cmake ..
7、make